[Coco] f83 for the 6809 -- It'a Alive!

[tim lindner]

On Fri, Oct 17, 2008 at 11:33 AM, Darren A <mechacoco at gmail.com> wrote:

> On 10/17/08, tim lindner wrote:

>

>> ....

>> .... with DSKCON comes a large portion of BASIC and

>> it's overhead. Whenever I imagine I'm in a position like Brett, I'm

>> always ripping DSKCON from the ROM and make it independant.

>>

>

> What "large portion of BASIC and it's overhead" are you referring to Tim?

>

> The Tandy versions of DSKCON are almost completely self-contained.

> Other than 2 calls to a short delay-loop subroutine in COLOR BASIC at

> $A7D1, there is no reliance on any other BASIC routines.

>

> Tandy's DSKCON does require use of the following RAM addresses:

> 008A - 008B:  Assumes these two bytes are always zero

> 00EA - 00F0:  The documented DSKCON parameter block

> 0109 - 010B:  NMI Vector (jumps to Disk Basic's service routine)

> 097E - 0986:  Variables  (TRKTBL,NMIFLG,DNMIVC,RDYTMR,DRGRAM)


Sometimes I think I mouth-off like this just so smarter people than I
can put me in my place. :)

A version of DSKCON that is relocatable and doesn't use predefined
variable address would be nice.


-- 
tim lindner
tlindner at macmess.org